Can I use fiberglass batts for subfloor insulation?
Brian writes from Dover, Pennsylvania: “I am making my attached garage into an extra living area. I am laying a sub-floor down with 2 x 4 sleepers on top on a moisture barrier. My question is: Can I use fiberglass batts for my subfloor insulation on top of the cement floor with the moisture barrier?” Answer: If you are going to lay down 2×4’s, I suggest Kraft-faced insulation with the vapor retarder up towards the living area stapled to the face. I would not use a moisture barrier on the concrete floor. This could cause trapped moisture between the Kraft paper and concrete.
